If you’re wondering, no, Android does not track the sound dose for music played over Bluetooth speakers or headphones, as the actual sound level of these devices can be set independently of the Android device.

Apparently, it will not work for Bluetooth audio devices. With wired being used less overall. Makes this feature a bit redundant unless they add support for Bluetooth.

This is a good feature if and only if there is an official way to turn it off. I do like that it might actually give you info on how loud it is, although I'm not sure how well that'll work. This can't possibly work as intended on all sound outputs, as some get much louder than others.

Android devices sold in the EU display a warning when headphones are connected and the user tries to raise the output volume level above 85 dB

No the don't, they pop that up when you try to raise the volume above some arbitrary percentage. What volume that corresponds to depends on the audio hardware, it might be barely audible. And now they're apparently gonna make that crap even worse.

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So, wait, they're seriously going to make this function MORE annoying than it already is?!

I'll probably turn it off anyway when it pops up the first time.

I've had this feature on my phone for quite a while since it's MIUI. But the issue I've had is that it will decrease the volume even when I'm connected to Bluetooth speakers or my car where it's easier to max the volume on the phone and control the volume on the speakers

Not too different than an old iPad, or maybe it was an iPod, used to do to me, when I'd listen for a while then it would just get quiet and I'd see that the screen had a volume warning on it.
Not new in general, but still good and valuable that it's being implemented more.

The bigger hitch/conundrum is getting people to care, on the personal/listener level, since, as we're aware, corporations profit off of us every second and would throw us all away if it earned them more money, so they're of course going to kinda half-ass the effort and let us keep letting our hearing systems go bad.
It doesn't help that under like 25 years old and you're still not really even perceiving the future as "real" yet.